update s.platform to 10

Author: Robert Murray

RNZendeskChat.podspec

@@ -9,7 +9,7 @@ Pod::Spec.new do |s|
   s.license      = package['license']
   s.authors      = package['author']
   s.homepage     = package['homepage']
-  s.platform     = :ios, "9.3"
+  s.platform     = :ios, "10"
   s.source       = { :git => "https://github.com/taskrabbit/react-native-zendesk-chat.git", :tag => "v#{s.version}" }
   s.source_files = "ios/*.{h,m}"
   s.static_framework = true